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CS4281-CQ Datenblatt(PDF) 11 Page - Cirrus Logic

Teilenummer CS4281-CQ
Bauteilbeschribung  CrystalClear PCI Audio interface
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Hersteller  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS4281-CQ Datenblatt(HTML) 11 Page - Cirrus Logic

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DS308PP4
11
CS4281
CrystalClear™ PCI Audio Interface
CIRRUS LOGIC PRODUCT DATA SHEET
HOST INTERFACE
The CS4281 host interface is comprised of two separate interface blocks which are memory mapped into
host address space. The interface blocks can be located anywhere in the host 32-bit physical address space.
The interface block locations are defined by the addresses programmed into the two Base Address Regis-
ters in the PCI Configuration Space. These base addresses are normally set up by the system’s Plug and
Play BIOS. The first interface block (Base Address 0) contains the general purpose configuration, control,
and status registers for the device. The second interface block (Base Address 1) maps the FIFO RAMs into
host memory space. The relationship between the Base Address Registers in the CS4281 PCI Configura-
tion Space and the host memory map is depicted in Figure 8. The bus mastering PCI bus interface complies
with the PCI Local Bus Specification (version 2.1).
Host
Memory
North
Bridge
CPU
South
Bridge
PCI Bus
CS4298
DAA
Telephone
Line
CS4281
PCI Audio Interface
PC/PCI
(if used)
Audio Out
Audio In
AC-Link
Figure 7. Modem Scenario
00h
Device ID / Vendor ID
Status / Command
Class Code / Revision
Base Address Register 0
Base Address Register 1
Misc. Control
(Memory Mapped, 4 kByte)
Device PCI Config. Space
04h
08h
0Ch
10h
14h
Direct Registers
Direct Memory Interface
(Memory Mapped, 6 kByte)
4
Figure 8. Host Interface Base Address Registers


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